"All areas that are on the Australian watch list for terrorists were the areas he was going to for his training, and that was when we contacted the Australian terrorist watch group with the Government and voiced our concerns about him, and wanted him to be kept out of that," he said.

"Last time I spoke to him face to face, he was very adamant he was a warrior for his faith and that was a huge warning bell.

"When I voiced my concerns about Tyler, they said they'd keep an eye on him, and as far as I'm concerned they've just sat back and let him do whatever it was that the people who was training him wanted him to do and now he's gone.

"To me, his death could have been prevented if the authorities stopped him from travelling.

"Here we are at the end of the day and it looks like they've done absolutely nothing. A beautiful young man dead, gone. It's a waste."